Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/f9f606979def
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22378 from mikehenrty/bug-1045345-fix-background

Bug 1045345 fix background

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https://hg.mozilla.org/integration/gaia-2_0/rev/f355aee1ce06
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1045345 - fix icon positioning

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https://hg.mozilla.org/integration/gaia-2_0/rev/58a5410b3b7e
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1045345 - Use existing strings for the upgrade tutorial
Bumping manifests a=b2g-bump